package com.ssm.controller;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
@RequestMapping("system")
public class CaptchaController {

	/**
	 * 验证码字体
	 */
	private final Font mFont = new Font("Arial Black", Font.PLAIN, 16);

	/**
	 * 验证码宽度
	 */
	private final int IMG_WIDTH = 80;

	/**
	 * 验证码高度
	 */
	private final int IMG_HEIGTH = 20;

	@RequestMapping("rand")
	public void execute(HttpServletRequest request, HttpServletResponse response) {
		response.setHeader("Pragma", "No-cache");
		response.setHeader("Cache-Control", "no-cache");
		response.setDateHeader("Expires", 0);
		response.setContentType("image/jpeg");
		BufferedImage image = new BufferedImage(IMG_WIDTH, IMG_HEIGTH, BufferedImage.TYPE_INT_RGB);
		Graphics g = image.getGraphics();
		Random random = new Random();
		g.setColor(getRandColor(200, 250));
		g.fillRect(1, 1, IMG_WIDTH - 1, IMG_HEIGTH - 1);
		g.setColor(new Color(102, 102, 102));
		g.drawRect(0, 0, IMG_WIDTH - 1, IMG_HEIGTH - 1);
		g.setColor(getRandColor(160, 200));
		for (int i = 0; i < 80; i++) {
			int x = random.nextInt(IMG_WIDTH - 1);
			int y = random.nextInt(IMG_HEIGTH - 1);
			int xl = random.nextInt(6) + 1;
			int yl = random.nextInt(12) + 1;
			g.drawLine(x, y, x + xl, y + yl);
		}
		g.setColor(getRandColor(160, 200));
		for (int i = 0; i < 80; i++) {
			int x = random.nextInt(IMG_WIDTH - 1);
			int y = random.nextInt(IMG_HEIGTH - 1);
			int xl = random.nextInt(12) + 1;
			int yl = random.nextInt(6) + 1;
			g.drawLine(x, y, x - xl, y - yl);
		}
		g.setFont(mFont);
		String sRand = "";
		for (int i = 0; i < 4; i++) {
			String tmp = getRandomChar();
			sRand += tmp;
			g.setColor(new Color(20 + random.nextInt(110), 20 + random
					.nextInt(110), 20 + random.nextInt(110)));
			g.drawString(tmp, 15 * i + 10, 15);
		}
		
		request.getSession().setAttribute("rand", sRand);
		//actionContext.getSession().put("rand", sRand);
		g.dispose();
		try {
			ImageIO.write(image, "JPEG", response.getOutputStream());
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	/**
	 * 随机获取颜色
	 * @param fc
	 * @param bc
	 * @return Color
	 */
	private Color getRandColor(int fc, int bc) {
		Random random = new Random();
		if (fc > 255){
			fc = 255;
		}
		if (bc > 255){
			bc = 255;
		}
		int r = fc + random.nextInt(bc - fc);
		int g = fc + random.nextInt(bc - fc);
		int b = fc + random.nextInt(bc - fc);
		return new Color(r, g, b);
	}

	/**
	 * 随机生成字符：大写字母、小写字母或数字
	 * 
	 * @return String
	 */
	private String getRandomChar() {
		int rand = (int) Math.round(Math.random() * 2);
		long itmp = 0;
		char ctmp = '\u0000';
		switch (rand) {
			case 1:
				itmp = Math.round(Math.random() * 25 + 65);
				ctmp = (char) itmp;
				return String.valueOf(ctmp);
			/*case 2:
				itmp = Math.round(Math.random() * 25 + 97);
				ctmp = (char) itmp;
				return String.valueOf(ctmp);*/
			default:
				itmp = Math.round(Math.random() * 9);
			return String.valueOf(itmp);
		}
	}
}
